Suman Devi Suman Devi Asked 3 months ago

How do you measure a tb test?

My son had a TB skin test done a couple of days back, and now there's a red raised area. I'm not sure how to correctly measure the induration. What's the right way to check the size and see if it's positive or negative?

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6 answers

Neha Rastogi Neha Rastogi Joined Jan 2026 3 months ago
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I remember crying so much when I had to get my skin test checked because the waiting period is so stressful. Please remember that you should not try to measure the bump yourself at home with a scale. Only a trained lab technician or doctor can measure the exact induration correctly, so try to stay calm until they see it.

Gurbaksh Singh Gurbaksh Singh Joined Mar 2026 3 months ago

Beta, don't scratch or touch that test area on your arm, and don't put any home remedies like turmeric or creams on it as it can ruin the test result. Go back to the hospital after 48 to 72 hours so the doctor can measure the swelling. Keep your body healthy and drink warm tulsi water to keep your immunity strong.

Akash Verma Akash Verma Joined Feb 2026 3 months ago

You need to return to the clinic within 48 to 72 hours for the reading. They measure the size of the hard raised area (called induration) in millimeters, not the redness. Make sure you don't miss the window, otherwise you will have to get the test done all over again.

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Saraswati Iyer Saraswati Iyer Joined Jun 2026 3 months ago

Trust the process and keep your mind peaceful during this time. The medical staff will measure the raised, hard area on your arm after 2 or 3 days using a special ruler. Just eat healthy food, pray, and let the doctors guide you with the results. Take care.

Rahul Banerjee Rahul Banerjee Joined Apr 2026 3 months ago

I just finished my treatment recently and had this skin test done. They strictly told me not to put any band-aid or rub the injection spot. When I went back on the second day, the nurse felt the bump with her fingers and measured it. It is very simple, so just let them do it.

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Madan Lal Madan Lal Joined Mar 2026 3 months ago

Bhaiya, isko khud se mat naapo. Doctor log ek khaas scale se dekhte hain ki kitna bada gola bana hai skin par. Aap bas teesre din hospital chale jao, wo khud dekh kar sahi parchi bana denge. Pareshan mat hona, sab theek hoga.

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